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I an repairing an 8559A that I acquired recently, unfortunately the
LD120CJ ADC chip has filed, possibly also the LD121CJ as well. Does
anyone have spares? I have tried the usual surplus outlets and none
have any, apart from those with $250 minimum orders. I know how the
circuit works and I will have to replace it if necessary, but a modern
voltmeter would not look right.

It has another fault with the gain level shifting on some bandwidth
ranges - I assume this is the usual switch contact problem like I had
on my 8558.

Regards
Mike

Hi!
Here is a link to AGILENT, the company which has take over some HP fuctions.
helmut_koenig@...
Hope he can help
Richard



----- Ursprüngliche Mail ----
Von: g0mjw <m.j.willisrl.ac.uk>
An: hp_agilent_equipment@...
Gesendet: Freitag, den 8. Dezember 2006, 09:16:53 Uhr
Betreff: [hp_agilent_equipment] HP8559A Display Chip













I an repairing an 8559A that I acquired recently, unfortunately the

LD120CJ ADC chip has filed, possibly also the LD121CJ as well. Does

anyone have spares? I have tried the usual surplus outlets and none

have any, apart from those with $250 minimum orders. I know how the

circuit works and I will have to replace it if necessary, but a modern

voltmeter would not look right.



It has another fault with the gain level shifting on some bandwidth

ranges - I assume this is the usual switch contact problem like I had

on my 8558.



Regards

Mike














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[Non-text portions of this message have been removed]

Hello Mike,

I bought a set from a local (Spanish) supplier a year and a half ago... I will check if they still have some. Not cheap but far from $250 :-)!

Regards,

JOSE

At 08:16 08/12/2006 +0000, you wrote:

I an repairing an 8559A that I acquired recently, unfortunately the
LD120CJ ADC chip has filed, possibly also the LD121CJ as well. Does
anyone have spares? I have tried the usual surplus outlets and none
have any, apart from those with $250 minimum orders. I know how the
circuit works and I will have to replace it if necessary, but a modern
voltmeter would not look right.

It has another fault with the gain level shifting on some bandwidth
ranges - I assume this is the usual switch contact problem like I had
on my 8558.

Regards
Mike

----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN) - Loc: IM99SM

Vintage Radio:
Vintage Test Equipment:
European Boatanchors List:

Hi,

The same chipset was used by Tektronix in the DM501A DMM. It might be easier to find a DM501A than the chips.

Good luck,

73 John Barnes VE3XRY

Mike,

Contact me at peterawson@... re: LD121CJ.

Pete Rawson